<link rel="stylesheet" href="<?php echo base_url()?>template/css/selectbox.css" type="text/css">

 <script src="<?php echo base_url()?>template/js/jquery.selectbox-0.5.js" type="text/javascript" charset="utf-8"></script>
  <script type="text/javascript" charset="utf-8">
      $(document).ready(function(){  
        //select box new
        $('.Items1234').selectbox();
        //endselect box new  
            
        }); //end 
  </script>
  
<div class="selectbox_div box_benh">
            <select id="select_benh"  class="select_benh Items1234" tabindex="3" name="idbenh" style="display: none;" >
            <option>Chọn bệnh</option>
            <?php if(!empty($benh)){
                $idbenh = $this->session->userdata('idbenh');
                foreach ($benh as $benh){                
                    echo '<option';
                    echo $idbenh==$benh->id?' selected="selected" ':'';
                    echo ' value="'.$benh->id.'">'.$benh->tenbenh.'</option>';
                }            
            }?>
            </select>
            </div>